Why would I use Search Merchandising?

Search results powered by Tagalys are sorted by the Trending Score (T-Score). T-Score is based on historical data, that predicts the future performance of each product. However, based on your business requirements, you can promote products on top of the Trending products to increase their visibility for individual search queries. 

By merchandising a search, you are essentially altering the results recommended by the  Tagalys algorithm.